Postflop 3-betting with air?

Today it seems there's been an epidemic on Stars of people minraising my c-bets. At first I'd yield when I had nothing, but I started getting curious and basically doing a 3x of their minraise and lo and behold.. last 4, I've gotten folds (all from half stacks or so, so my raise was like 3/4 of their remianing chips.)

Obviously the answer is "it depends", but without reads, how apt are you to re-raise a flop minraise with air? With TPTK? Worse? Obviously if they come over the top I pitch and if they call I'm quite liable to c/f the turn, but this seems to be working quite well, for now.

Thoughts?

maybe they are trying to play you - if im raised after i've been c-betting with air, i usually slow down a bit - sounds like if its working keep it up - i have had bad experience with most players doing this with air because the players im against don't realize they are supposed to fold :) but if im TPTK i will repop usually - air i let it go - draw i will call (any draw is good for this, IMO - hitting a gut draw drives players crazy) but again, if they are just min-raising, they are saying they have a marg. hand, but its better than mine - if i have anything im sticking around but trying to keep it small...if not im dumping -

Sometimes firing turn and river barrels works great and it feels good to steal - but when it doesn't i just start shaking my head by losing a big pot to some donk who won't fold bottom pair -

i'm more likely to do this if there are draws on the board.